RE-TRANSMITTED ANALOG OUTPUT (OPTIONAL)
The re-transmitted analog output option transmits a digitally programmable 4
to 20 mA or 0 to 10 VDC signal to drive chart recorders, remote indicators and
controllers. The option is contained on the upper PCB and has two outputs,
“ANALOG-” (TBB #10) and “ANALOG+” (TBB #11) and is self-powered
(active) with a compliance of 10 VDC. The analog “-” output is isolated from the
signal input common, eliminating problems from ground loops. Programming of
the option is performed in “Pro 8” of the normal programming mode. Display
values are simply keyed in to providea4mAor0VDCoutput, “AN-LO”, and a
20 mA or 10 VDC output, “AN-HI”.
The analog output then follows the displayed value and as such will update
every measurement cycle. Nonstandard current or voltage ranges can be
supported by calculating the slope and intercept of the display/output and
calculating the required display values at 4 mA or 0 VDC and 20 mA or 10 VDC.
Reverse action can be achieved by programming a “high” display value for
“AN-LO” and a “low” display value for “AN-HI”.
If the display should indicate an “OLOLOL” or “ULULUL” the analog output
will go to 20 mA or 10 VDC for an open and 4 mA or 0 VDC for a short.
Note: Analog “-” must be kept isolated from alarm comm. (TBB #8).
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ANALOG OUTPUT DIAGRAMS
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